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99 yz bogs down

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i just rebuilt the top end on this 99 yz125 and it bogs down till you get to half throttle and then takes off.it did the same thing before the rebuild too.it has a BILLS pipe on it, is it possible that it needs jetted?other than that the bike runs fine

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the jetting is very possible if the jetting is still stock. it seems i just had the same prob with my 2004 yz 125. there is also a thread on here about how the float bowl in the carb can be bent and allowing too much gas in causing it to flood. the problem i had with my yz is that the jet needle was bent at the tip just slightly. does it seem that your throttle sticks a little bit? you may want to take your carb apart and check all of these possible problems. keep us posted!

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A bog normally points to a lean condition, have you tried turning in your airscrew some and seeing if it gets any better

Wondering if your powervalve is functioning properly?

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